Add CSD to border modes

This replaces view.using_csd with a new border mode: B_CSD. This also
removes sway_xdg_shell{_v6}_view.deco_mode and
view->has_client_side_decorations as we can now get these from the
border.

You can use `border toggle` to cycle through the modes including CSD, or
use `border csd` to set it directly. The client must support the
xdg-decoration protocol, and the only client I know of that does is the
example in wlroots.

If the client switches from SSD to CSD without us expecting it (via the
server-decoration protocol), we stash the previous border type into
view.saved_border so we can restore it if the client returns to SSD. I
haven't found a way to test this though.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index 5e281a2f..6019602c 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -28,6 +28,7 @@ enum sway_container_border {
         B_NONE,
         B_PIXEL,
         B_NORMAL,
+        B_CSD,
 };
 
 struct sway_root;
@@ -63,7 +64,6 @@ struct sway_container_state {
         bool border_bottom;
         bool border_left;
         bool border_right;
-        bool using_csd;
 };
 
 struct sway_container {